package com.infomancers.collections.yield.asm.delayed;

import org.objectweb.asm.MethodVisitor;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * Copyright (c) 2007, Aviad Ben Dov
 * <p/>
 * All rights reserved.
 * <p/>
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 * <p/>
 * 1. Redistributions of source code must retain the above copyright notice, this list
 * of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice, this
 * list of conditions and the following disclaimer in the documentation and/or other
 * materials provided with the distribution.
 * 3. Neither the name of Infomancers, Ltd. nor the names of its contributors may be
 * used to endorse or promote products derived from this software without specific
 * prior written permission.
 * <p/>
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

public class MethodEmitter extends DelayedInstructionEmitter {
    private Pattern pattern = Pattern.compile("[IZBSLDF]|L.*;");

    /**
     * @param insn
     * @param params Should be: [owner, name, desc]
     */
    public MethodEmitter(int insn, Object... params) {
        super(insn, params);
    }

    @Override
    public void emit(MethodVisitor mv) {
        mv.visitMethodInsn(insn, (String) params[0], (String) params[1], (String) params[2]);
    }

    @Override
    public int pushAmount() {
        return getDesc().substring(getDesc().lastIndexOf(')') + 1).equals("V") ? 0 : 1;
    }

    @Override
    public int popAmount() {
        String desc = getDesc().substring(1, getDesc().lastIndexOf(')'));
        int res = 0;
        Matcher m = pattern.matcher(desc);
        while (m.find()) {
            res++;
        }

        return res;
    }

    private String getDesc() {
        return (String) params[2];
    }
}
